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<div class="header">
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<div class="title">StackInfluenceAnalyzer.cs</div>  </div>
</div><!--header-->
<div class="contents">
<a href="_stack_influence_analyzer_8cs.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="keyword">using</span> System;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="keyword">using</span> System.Collections.Generic;</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="keyword">using</span> System.Linq;</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="keyword">using</span> System.Text;</div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="keyword">using</span> System.Reflection;</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="keyword">using</span> System.Reflection.Emit;</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="keyword">using</span> SDILReader;</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="keyword">using</span> SystemSharp.Common;</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="keyword">namespace </span>SystemSharp.Analysis.Msil</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;{</div>
<div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_operands.html">   34</a></span>&#160;    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">class </span><a class="code" href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_operands.html">StackOperands</a></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    {</div>
<div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_operands.html#accb0072b076891bfc9e9496800c9d41d">   41</a></span>&#160;        <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_operands.html#accb0072b076891bfc9e9496800c9d41d">GetNumOperands</a>(StackBehaviour sb)</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;        {</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;            <span class="keywordflow">switch</span> (sb)</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;            {</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Pop0:</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Push0:</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Varpop:</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Varpush:</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;                    <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Pop1:</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popi:</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popref:</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;                    <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Pop1_pop1:</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popi_pop1:</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popi_popi:</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popi_popi8:</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popi_popr4:</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popi_popr8:</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popref_pop1:</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popref_popi:</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;                    <span class="keywordflow">return</span> -2;</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popi_popi_popi:</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popref_popi_pop1:</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popref_popi_popi:</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popref_popi_popi8:</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popref_popi_popr4:</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popref_popi_popr8:</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Popref_popi_popref:</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;                    <span class="keywordflow">return</span> -3;</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Push1:</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Pushi:</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Pushi8:</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Pushr4:</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Pushr8:</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Pushref:</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;                    <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;                <span class="keywordflow">case</span> StackBehaviour.Push1_push1:</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;                    <span class="keywordflow">return</span> 2;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;                <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;                    <span class="keywordflow">throw</span> <span class="keyword">new</span> NotImplementedException();</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;            }</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;        }</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    }</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_influence_analysis.html">   95</a></span>&#160;    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">class </span><a class="code" href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_influence_analysis.html">StackInfluenceAnalysis</a></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    {</div>
<div class="line"><a name="l00104"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_influence_analysis.html#aaaf05d23cc428de654aa86fbb16c7a41">  104</a></span>&#160;        <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_influence_analysis.html#aaaf05d23cc428de654aa86fbb16c7a41">GetStackBilance</a>(<a class="code" href="class_s_d_i_l_reader_1_1_i_l_instruction.html">ILInstruction</a> ili, MethodBase method, out <span class="keywordtype">int</span> npop, out <span class="keywordtype">int</span> npush)</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;        {</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;            <span class="keywordflow">if</span> (ili.<a class="code" href="class_s_d_i_l_reader_1_1_i_l_instruction.html#ac95902d23bb8b8c11b72fa7f59639fcd">Code</a>.Equals(OpCodes.Ret))</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;            {</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;                Type returnType;</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;                <span class="keywordflow">if</span> (method.IsFunction(out returnType))</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;                    npop = 1;</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;                <span class="keywordflow">else</span></div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;                    npop = 0;</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;                npush = 0;</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;            }</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;            <span class="keywordflow">else</span> <span class="keywordflow">if</span> (ili.<a class="code" href="class_s_d_i_l_reader_1_1_i_l_instruction.html#ac95902d23bb8b8c11b72fa7f59639fcd">Code</a>.Equals(OpCodes.Call) ||</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;                ili.Code.Equals(OpCodes.Calli) ||</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;                ili.<a class="code" href="class_s_d_i_l_reader_1_1_i_l_instruction.html#ac95902d23bb8b8c11b72fa7f59639fcd">Code</a>.Equals(OpCodes.Callvirt) ||</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;                ili.Code.Equals(OpCodes.Newobj))</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;            {</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;                MethodBase mi = (MethodBase)ili.<a class="code" href="class_s_d_i_l_reader_1_1_i_l_instruction.html#aad0d860f180f9616294ab5c9977d71a9">Operand</a>;</div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;                ParameterInfo[] pis = mi.GetParameters();</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;                npop = pis.Length;</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;                <span class="keywordflow">if</span> (ili.<a class="code" href="class_s_d_i_l_reader_1_1_i_l_instruction.html#ac95902d23bb8b8c11b72fa7f59639fcd">Code</a>.Equals(OpCodes.Calli))</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;                    ++npop;</div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;                <span class="keywordflow">if</span> (mi.CallingConvention.HasFlag(CallingConventions.HasThis) &amp;&amp;</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;                    !ili.Code.Equals(OpCodes.Newobj))</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;                    ++npop;</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;                Type returnType;</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;                <span class="keywordflow">if</span> (mi.IsFunction(out returnType) ||</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;                    ili.Code.Equals(OpCodes.Newobj))</div>
<div class="line"><a name="l00131"></a><span class="lineno">  131</span>&#160;                    npush = 1;</div>
<div class="line"><a name="l00132"></a><span class="lineno">  132</span>&#160;                <span class="keywordflow">else</span></div>
<div class="line"><a name="l00133"></a><span class="lineno">  133</span>&#160;                    npush = 0;</div>
<div class="line"><a name="l00134"></a><span class="lineno">  134</span>&#160;            }</div>
<div class="line"><a name="l00135"></a><span class="lineno">  135</span>&#160;            <span class="keywordflow">else</span></div>
<div class="line"><a name="l00136"></a><span class="lineno">  136</span>&#160;            {</div>
<div class="line"><a name="l00137"></a><span class="lineno">  137</span>&#160;                npop = -StackOperands.GetNumOperands(ili.Code.StackBehaviourPop);</div>
<div class="line"><a name="l00138"></a><span class="lineno">  138</span>&#160;                npush = StackOperands.GetNumOperands(ili.Code.StackBehaviourPush);</div>
<div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;            }</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;        }</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;</div>
<div class="line"><a name="l00149"></a><span class="lineno"><a class="line" href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_influence_analysis.html#a51c066c08f523df9e45e29d5ca20247e">  149</a></span>&#160;        <span class="keyword">public</span> <span class="keyword">static</span> IEnumerable&lt;int&gt; <a class="code" href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_influence_analysis.html#a51c066c08f523df9e45e29d5ca20247e">GetStackElementDefinitions</a>(<span class="keywordtype">int</span> ilIndex, <span class="keywordtype">int</span> stackLevel, <a class="code" href="class_system_sharp_1_1_analysis_1_1_method_code.html">MethodCode</a> cfg)</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;        {</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;            Queue&lt;Tuple&lt;int, int&gt;&gt; q = <span class="keyword">new</span> Queue&lt;Tuple&lt;int, int&gt;&gt;();</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;            <span class="keywordtype">bool</span>[] visited = <span class="keyword">new</span> <span class="keywordtype">bool</span>[cfg.Instructions.Count];</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;            <span class="keywordflow">foreach</span> (<a class="code" href="class_s_d_i_l_reader_1_1_i_l_instruction.html">ILInstruction</a> pred <span class="keywordflow">in</span> cfg.GetPredecessors(ilIndex))</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;            {</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;                q.Enqueue(Tuple.Create(pred.Index, stackLevel));</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;            }</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;            <span class="keywordflow">while</span> (q.Count &gt; 0)</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;            {</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;                Tuple&lt;int, int&gt; cur = q.Dequeue();</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;                <span class="keywordtype">int</span> curIndex = cur.Item1;</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;                <span class="keywordtype">int</span> curLevel = cur.Item2;</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;                visited[curIndex] = <span class="keyword">true</span>;</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;                <span class="keywordtype">int</span> npush, npop;</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;                GetStackBilance(cfg.Instructions[curIndex], cfg.Method, out npop, out npush);</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;                <span class="keywordflow">if</span> (npush + curLevel &gt;= 1)</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;                {</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;                    yield <span class="keywordflow">return</span> curIndex;</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;                }</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;                <span class="keywordflow">else</span></div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;                {</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;                    <span class="keywordtype">int</span> delta = npush - npop;</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;                    <span class="keywordtype">int</span> nextLevel = curLevel + delta;</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;                    <span class="keywordflow">if</span> (nextLevel &gt; 0)</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;                        <span class="keywordflow">throw</span> <span class="keyword">new</span> InvalidOperationException(<span class="stringliteral">&quot;Illegal stack behavior detected in method &quot;</span> + cfg.Method);</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;                    <span class="keywordflow">foreach</span> (<a class="code" href="class_s_d_i_l_reader_1_1_i_l_instruction.html">ILInstruction</a> pred <span class="keywordflow">in</span> cfg.GetPredecessors(curIndex))</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;                    {</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;                        <span class="keywordflow">if</span> (!visited[pred.<a class="code" href="class_s_d_i_l_reader_1_1_i_l_instruction.html#aa454e633d8cfb3b7f306c70c8361c48b">Index</a>])</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;                            q.Enqueue(Tuple.Create(pred.Index, nextLevel));</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;                    }</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;                }</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;            }</div>
<div class="line"><a name="l00182"></a><span class="lineno">  182</span>&#160;        }</div>
<div class="line"><a name="l00183"></a><span class="lineno">  183</span>&#160;</div>
<div class="line"><a name="l00184"></a><span class="lineno">  184</span>&#160;    }</div>
<div class="line"><a name="l00185"></a><span class="lineno">  185</span>&#160;}</div>
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<div class="ttc" id="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_operands_html"><div class="ttname"><a href="class_system_sharp_1_1_analysis_1_1_msil_1_1_stack_operands.html">SystemSharp.Analysis.Msil.StackOperands</a></div><div class="ttdoc">Static helper class for dealing with the StackBehavior type </div><div class="ttdef"><b>Definition:</b> <a href="_stack_influence_analyzer_8cs_source.html#l00034">StackInfluenceAnalyzer.cs:34</a></div></div>
<div class="ttc" id="class_s_d_i_l_reader_1_1_i_l_instruction_html_aa454e633d8cfb3b7f306c70c8361c48b"><div class="ttname"><a href="class_s_d_i_l_reader_1_1_i_l_instruction.html#aa454e633d8cfb3b7f306c70c8361c48b">SDILReader.ILInstruction.Index</a></div><div class="ttdeci">int Index</div><div class="ttdef"><b>Definition:</b> <a href="_i_l_instruction_8cs_source.html#l00063">ILInstruction.cs:63</a></div></div>
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